M’s Prospect Monthly: O’Neill, Moore, Herb stand out

The Seattle Mariners began the season the owners of one of the thinnest farm systems in baseball. The only depth in the organization resides on the mound and all but one of the upside plays there began the season above Advanced-A ball and three of them didn’t start the year assigned to a full-season affiliate. Player development, the biggest factor in the sinking of the farm system under Jack Zduriencik — a system once ranked among the Top 10, only to fade fast thanks to rush jobs and poor planning…

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